Hi Rob,
Several years ago when my car was restored, 2001, I bought one of these either from Miller's or Bud's. Check with these guys, or the usual gang of suspects! Note that the first one I bought was around $8.00 or so, very cheap. Then, in 2002, my car had an "unfortunate occurance" with the transmission which, alas, destroyed this part.
In the ensuing repair, the local mechanic sourced one from another place, this one with a light. It cost something like $60.00. Ouch. And, the light is most annoying, about the brightest thing in the cockpit at night. It's on my list of things to remove, but I don't often drive at night so it does not get high on the priority list.
Michael Salemi
1969 280SL
Signal Red w/Black Leather
Restored